package servlet;

import com.fasterxml.jackson.databind.ObjectMapper;
import model.User;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/userInfo")
public class UserInfoServlet extends HttpServlet {
    private final ObjectMapper objectMapper = new ObjectMapper();
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //前端发起获取当前登录用户的信息请求，从会话中获取user对象，转成json并返回
        HttpSession session = req.getSession(false);
        if(session == null) {
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("用户未登录");
            return;
        }
        User user = (User) session.getAttribute("user");
        if(user == null) {
            resp.setContentType("text/html; charset=utf8");
            resp.getWriter().write("用户未登录");
            return;
        }
        user.setPassword("");//避免密码泄露
        resp.setContentType("application/json; charset=utf8");
        String respJson = objectMapper.writeValueAsString(user);
        resp.getWriter().write(respJson);
    }
}
